diff --git a/app.yaml b/app.yaml
index 19e38c1..9f936c7 100644
--- a/app.yaml
+++ b/app.yaml
@@ -1,6 +1,6 @@
 id: t11
 name: t11
-version: 2.15.8
+version: 2.15.9
 author: t11
 icon: ''
 desc: t11
diff --git a/test/test_decect.py b/test/test_decect.py
index 2c33f50..b527270 100644
--- a/test/test_decect.py
+++ b/test/test_decect.py
@@ -36,7 +36,7 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     print(f"[detect_circle_v3] begin {datetime.now()}")
     # -- 1. 缩图加速（与三角形路径保持一致）
     h_orig, w_orig = img_cv.shape[:2]
-    MAX_DET_DIM = 320
+    MAX_DET_DIM = 480
     long_side = max(h_orig, w_orig)
     if long_side > MAX_DET_DIM:
         det_scale = MAX_DET_DIM / long_side
@@ -81,10 +81,10 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     red_candidates = []
     for cnt_r in contours_red:
         ar = cv2.contourArea(cnt_r)
-        if ar <= 30:
+        if ar <= 10:
             continue
         pr = cv2.arcLength(cnt_r, True)
-        if pr <= 0 or (4 * np.pi * ar) / (pr * pr) <= 0.4:
+        if pr <= 0 or (4 * np.pi * ar) / (pr * pr) <= 0.3:
             continue
         if len(cnt_r) >= 5:
             (xr, yr), (wr, hr), _ = cv2.fitEllipse(cnt_r)
@@ -100,13 +100,13 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     valid_targets = []
     for cnt_yellow in contours_yellow:
         area = cv2.contourArea(cnt_yellow)
-        if area <= 50:
+        if area <= 15:
             continue
         perimeter = cv2.arcLength(cnt_yellow, True)
         if perimeter <= 0:
             continue
         circularity = (4 * np.pi * area) / (perimeter * perimeter)
-        if circularity <= 0.7:
+        if circularity <= 0.5:
             continue
         print(f"[target] -> 面积:{area:.1f}, 圆度:{circularity:.2f}")
         if len(cnt_yellow) >= 5:
diff --git a/version.md b/version.md
index d402359..03944cd 100644
--- a/version.md
+++ b/version.md
@@ -18,4 +18,5 @@
 # 2.15.5 打印ota进度
 # 2.15.6 更新版本号
 # 2.15.7 更新版本号
-# 2.15.8 启动不加载预加载yolo
\ No newline at end of file
+# 2.15.8 启动不加载预加载yolo
+# 2.15.9 20cm
\ No newline at end of file
diff --git a/version.py b/version.py
index e0e438b..06a62c3 100644
--- a/version.py
+++ b/version.py
@@ -4,6 +4,6 @@
 应用版本号
 每次 OTA 更新时，只需要更新这个文件中的版本号
 """
-VERSION = '2.15.7'
+VERSION = '2.15.9'
 
 
diff --git a/vision.py b/vision.py
index 50cd9ee..556803f 100644
--- a/vision.py
+++ b/vision.py
@@ -535,7 +535,7 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     logger.debug(f"[detect_circle_v3] begin {datetime.now()}")
     # -- 1. 缩图加速（与三角形路径保持一致）
     h_orig, w_orig = img_cv.shape[:2]
-    MAX_DET_DIM = 320
+    MAX_DET_DIM = 480
     long_side = max(h_orig, w_orig)
     if long_side > MAX_DET_DIM:
         det_scale = MAX_DET_DIM / long_side
@@ -580,10 +580,10 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     red_candidates = []
     for cnt_r in contours_red:
         ar = cv2.contourArea(cnt_r)
-        if ar <= 30:
+        if ar <= 10:
             continue
         pr = cv2.arcLength(cnt_r, True)
-        if pr <= 0 or (4 * np.pi * ar) / (pr * pr) <= 0.4:
+        if pr <= 0 or (4 * np.pi * ar) / (pr * pr) <= 0.3:
             continue
         if len(cnt_r) >= 5:
             (xr, yr), (wr, hr), _ = cv2.fitEllipse(cnt_r)
@@ -599,13 +599,13 @@ def detect_circle_v3(frame, laser_point=None, img_cv=None):
     valid_targets = []
     for cnt_yellow in contours_yellow:
         area = cv2.contourArea(cnt_yellow)
-        if area <= 50:
+        if area <= 15:
             continue
         perimeter = cv2.arcLength(cnt_yellow, True)
         if perimeter <= 0:
             continue
         circularity = (4 * np.pi * area) / (perimeter * perimeter)
-        if circularity <= 0.7:
+        if circularity <= 0.5:
             continue
         if logger:
             logger.info(f"[target] -> 面积:{area:.1f}, 圆度:{circularity:.2f}")